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Sigit Supadmo Arif
Fakultas Teknologi Pertanian, Universitas Gadjah Mada
Agriculture, Biological Sciences & Forestry

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Modifikasi Model Hidrologi Tangki Sugawara Untuk Analisis Regim Air di Lahan Sawah Beririgasi Susilan Hidayat; Sahid Susanto; Sigit Supadmo Arif
agriTECH Vol 13, No 3 (1993)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2958.345 KB) | DOI: 10.22146/agritech.19269

Abstract

Model hidrologi tangki Sugawara telah dimodifikasi dan diterapkan di lahan sawah beririgasi, dengan kajian kasus di petak tersier BP 1 Ka di DI Pijenan. Hasil kaliberasi model menunjukkan bahwa model dapat menampilkan unjuk kerja yang cukup memadai. Model selanjutnya digunakan untuk analisis regim air di petak irigasi tersier tersebut, dengan membagi regim air menjadi lima komponen, yaitu: (a) pemberian air irigasi, I; (b) evapotranspirasi aktual, Eta; (c) perkolasi, P; (d) air yang keluar dari petak, Qo; dan (e) kehilangan air tak terkontrol, L. Rata-rata jumlah air untuk masing-masing komponen diperoleh: I = 9,06 mm/hari (1,05 It/dt/ha); Eta = 3,69 mm/hari; P = 1,25 mm/hari; Qo = 1,63 mm/hari (0,19 It/dt/ha); dan L = 6,21 mm/hari (0,72 It/dI/ha). Nilai efisiensi pemberian air irigasi di petak tersebut selama penelitian berkisar antara 21% hingga 75%, dengan rata-rata sebesar 42%. Sedangkan untuk pemberian air irigasi yang optimal diperoleh angka 1,3 It/dt/ha.
Kinerja Alat Pencurah Sederhana Pada Sistem Irigasi Curah (Sprinkler Irrigation System) Saiful Rochdyanto; Sigit Supadmo Arif; Isti Susilawati
agriTECH Vol 17, No 2 (1997)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1338.654 KB) | DOI: 10.22146/agritech.19330

Abstract

The modification of fabricated sprinkler which is available in the market was done in order to solve several problems, such as : the performance is unsatisfied, the prize is relatively high, the construction is complicated, and the operation and maintenance is not too easy. The performance testing was carried out to six model of modification sprinklers, they were : Sl, S2, S3, S4, S5, and S6, and then compared with fabricated sprinkler (SP). Sprinklers were tested with several parameters, such as : water discharge, throw distance, water distribution pattern, water rate, and particle water diameter. Result of experiment showed that S5 gives the best performance. This model has upper arm length = 5.0 cm, lower arm length = 3.8 cm, nozzle angle in upper arm = 65°, nozzle angle in lower arm = 40°, the number of nozzle in each lower arm and top of arm is one. Comparing with fabricated sprinkler (SP), the prize of S5 model is relatively cheap. It is Rp. 5,575.00 for S5 and Rp. 17,500.00 for SP. Due to the construction is relatively simple and the product material is very easy to find in local market, so the model S5 can be introduced and developed to farmers in order to increase their agricultural production.
Penentuan Transmisivitas dan Porositas Efektif Untuk Mengkaji Proses Gerakan Airtanah Pada Lahan Heterogen Mahmud Achmad; Sigit Supadmo Arif
agriTECH Vol 17, No 4 (1997)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (955.072 KB) | DOI: 10.22146/agritech.19338

Abstract

The main purpose of this research is to determine properties of non-homogeneous ill-drained area which are reflected by transmissivity and effective porosity. The flow of water was analyzed using Darcy law and Boussinesq equations which were developed based on analogy theory of heat conduction to 2-Dimension (pseudo 3-D) of transient water flow. Based on the formula, transmissivity and effective porosity have been determined through mathematical model. The model needs daily deep water table as the main data. The model was tested in PG Jatitujuh Cirebon. The transmissivity and effective porosity information were very useful to solving drainage problems in the ill-drained area. Result of iteration method indicated that the land have 11 and S are 0,070 - 0,698 rnlm and 0,10 - 91,0 m2/day respectively. A R-square test was used to compare deep water table between observation data and output model each of bore hole, and was found average R-square is 0,8519 and standard of error is 0,0981.
Pemakaian Hasil Analisis Harmonik Hasil Sedimen (Sediment Yield) Untuk Pemantauan dan Evaluasi Manajemen Daerah Aliran Sungai (DAS) (Studi Kasus Di Sub DAS Tapan) Sigit Supadmo Arif
agriTECH Vol 16, No 1 (1996)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2382.641 KB) | DOI: 10.22146/agritech.22507

Abstract

Departemen Kehutanan sebagai instansi pemerintah yang bertanggung jawab atas kelestarian hutan dan lahan atasan di suatu Daerah Aliran Sungai (DAS) telah melaksanakan beberapa program beserta tindakan pemantauan dan evalualinya (monitoring and evaluation), meskipun belum mempunyai prosedur dan metode yang baku. Tujuan utama tulisan ini ialah melakukan evaluasi manajemen DAS dengan memakai analisis harmonik hasil sedimen sebagai salah satu peubah (variable) pemantauan (monitoring) usaha perbaikan manajemen lahan yang telah dilakukan, dengan mengasumsikan bahwa proses perubahan watak DAS dalam kurun waktu yang ditinjau berlangsung dalam keadaan tunak. Lokasi penelitian dilakukan di Sub DAS Tapan yang merupakan bagian DAS Bengawan Solo. Analisis dilakukan terhadap data hasil sedimen untuk kurun waktu 1974 - 1979, 1983 -1988 dan 1986 - 1990. Hasil analisis menunjukkan bahwa pemakaian analisis harmonik memberikan akurasi nisbi tinggi pada kurun-kurun waktu awal dan semakin lama semakin mengecil untuk kurun-kurun waktu setelahnya. Hal ini dapat disimpulkan bahwa perubahan watak DAS dalam keadaan tunak berlangsung pada kurun waktu awal untuk kemudian berangsur-angsur berubah menjadi proses tak lunak sesuai dengan proses perubahan tata guna lahan. Proses tak tunak juga ditunjukkan oleh perubahan harga koelisien limpasan, fo, dalam kurun waktu yang ditinjau.
Pengembangan Model Operasi Pompa Berkelanjutan di Daerah Irigasi Sumur Pompa Dangkal Murtiningrum Murtiningrum; Sigit Supadmo Arif; Saiful Rochdyanto
agriTECH Vol 16, No 1 (1996)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4246.253 KB) | DOI: 10.22146/agritech.22510

Abstract

Model of sustainable pump operation in an unconfined groundwater irrigation system was developed to determine pump operation pattern which consist of the number of pumps, duration, and distance between pumps, so that crop water requirement is fulfilled and groundwater irrigation system is sustained. Total irrigation flow, EQpi, results in lowering water table which is called drawdown, sn. Drawdown sn should be less than di (sn< di) which (d1 is maximum drawdown which is affected by pump technology. Model outputs for the area of Sri Rahayu Farmer Group in Kedungtuban, Blora for existing cropping pattern show that average irrigation water requirement is 916.1mm/year and peak flow is 4.93 ips. It still can be fulfilled by 1, 2, 3, 4, or 9 pumps for 10 days operation continuously which is shown by the drawdowns which are less than maximum drawdown.
Co-Authors Isti Susilawati Mahmud Achmad Murtiningrum Murtiningrum Sahid Susanto Saiful Rochdyanto Susilan Hidayat